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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35c340732f96ce4305cd7a736b8f502c1fa947627cab7bbb8b93d3ec61137b52' 
  AND token = 'QKf9FD7Eue11s9Uu2F22kPwlQKyE1RGEKUZXrzcJZbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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