Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03039c0edcf7981b617f54e39621bfe212667eaf3ce09329db270949bcdcb19f' 
  AND token = 'fHYmWIq6Rr4m95pvv16U0Mv2kloXo20SsFzhl8IQasI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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