SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc3007ab7876fbf33d5e5d6f98db1111a96d8ae5264a815970f9f6b94ac64812' 
  AND token = 'BKQGbYjyMSiJwosIZc8XcgZdECP2y63aDE0zR7LGjeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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