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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ecf17fd2e2aa3c244600a64661e27aaa99af713ce35f4df35883ee6c032fbae' 
  AND token = '1pRD63OhWkS8UUYukd97xj8B0hAiz86z6CqvCMWWVJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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