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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c03d5af0e06eb3b654d9e4baf733342929d0bd3a75c66a181744118d712890ca' 
  AND token = 'qeuKDI2gNFkm+s3oDVLbQ2NHEsMIvDIr2AhdFjE7PA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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