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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccf04d9a029cfc6c75513547c35ecf29eb6806355ded015feb0fcf4e821c38a3' 
  AND token = 'tO4IUlQceT9T6pemKr2KSACYA+ZmgzA1POr9BdE18TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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