SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '018bb4ea02c531f00127fda1dfd477fffb7f21ca445c67e937ad493e1fec5c0e' 
  AND token = 'TjZRdbl+r6XxOGvmHtfNb/waGKODgK5CKVJTHUBEYkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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