Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '751f905756aea903e5735a63a089b5f4dc4d934a52decdbf341d7748b43b12b4' 
  AND token = 'reRl1tjNcYjenV2dj1a/ubNyYVTJf6sfM9tOfRp2BSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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