SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '131c5c8daee95fc35d4eddd2741a1382842b5f2400803934867c35f18ef8fb8c' 
  AND token = 'M//IxjeWQtqNxw1BzDrYRBX3FTC5jcep+gsVYoPNf8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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