SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d1f36f4359e0461f551295ae24ee290b5addbdf8e4b0a47e37c306554066b15' 
  AND token = '3bukJqrwb6fIiHjvUNzmVQHuDPC6KFIInpCGd6ee3gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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