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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c494844f223588ee227ec5581644d31e8871a98e2cab48fdca0364c54eaa9638' 
  AND token = 'arSrXwo2GkNaPaAP6fHEPRSpcaSo2vNMLX7c8oPkTtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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