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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b57f6f84ffdb646018876f9bd4309c6855aae20c12b6bb11f6a0ae71381f5443' 
  AND token = '1jTR4xoYjeANdUFg3f1nOdKnTF21h35A49kpY33lgfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}