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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c32f2d43083fd57d54abe5b4e560586183c53a640f91db0fd6b1d98673f681d' 
  AND token = 'ASZOcliWMfUVrFTFhtgHt4dBIuf7mX5bQSlwpg8C/gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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