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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11d7926d4dd44d1008a6c52db526adb1dcaf7ac57e75720ece94cb2c2a98f661' 
  AND token = 'wUFiWxJ+Shyuj7bJFKGCjFOPyWdXaeivy58Mc+hOGdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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