SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd602f6e1aed69e26e171251a4efa7ce466cb854f89979a5682d317b8baa7f14e' 
  AND token = 'AFEzK/qT2qUexfGNVu+hlEgjv7p+g6dPHCqGDHTN89o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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