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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60a93f7600a9e626d9163b77b80b94366ba11f29f16e666a4c877ddbeefd5f75' 
  AND token = 'DlYwMIC8dJQkv2Qf66guHv8QwZyuhwcWlSqo2Z6SdVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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