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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b21d859e6e3df7346707c556adb58f5dfcdc01345be112eb1628950b7c21ac9' 
  AND token = 'lVLP1bfNpFj4QuZ6Nnk3pJL7JQy2UNwgWzt01TbnuB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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