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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2604c2366bb402f6bc1436b3821da2d1b85c482468f7606d52f0d586c9cfc640' 
  AND token = '+9uuEgOD9ojd9QhocfVr6XFvBbp/aOcPcrhkzies1wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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