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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bbe5c105ed8c1331351a68f76d91e1b5f5d73077f9d6f52acefda1036ca93ab' 
  AND token = '2vmvUYpI9BT96FiRbSaBsWRiymfYUVhhnUIfJPskiY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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