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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e107a3efcbd2158252054db60fedac6e36b1d161e013175386c128c5edccff12' 
  AND token = 'awHq7vH6h8iBRbsvKPwnr/7NuA2NwSlC1SUNnXGTA2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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