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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7c37efe7872d3a21a6c5cad871696ae511d9dc5012899ede5469fbd15024d3c' 
  AND token = 'qznQyR3a4dCXERRcT7G5d0a0K12CyPXhEZKDWI/7V9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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