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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fed5ab96f0572a77b892c362ba5e2c2a2c99902ecf1b799e306a83cb1d0315ce' 
  AND token = 'niCO1T0ZwUgBIlt2nibqQazoOQNqo0eDHZQxeVkSJZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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