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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '784457bfa85d0d85c50c00a36918a87bf64c44214aea24288ea7984213ab463b' 
  AND token = 'o783J4PdUJy9/u0WluTeDAd+g7NCxXwySHuqkpBAz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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