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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a2145356102d5c7c201de88d588b323d206fc13aadccd711fc605f4df9a0d58' 
  AND token = 'X16v4NqD5wYaCOJ7t6VRYeVJ1+YJ4dTD2UaZ0IB5ajI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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