SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42c22a3f4df95041437cda87c3e2b14e734d046b6aadd0260f59a2b4eb6b1ed0' 
  AND token = 'capwXdq5LcVqzZUAJNujqL3vYEHinNE83zHnAd/PqwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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