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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52351e551e5c9776da0ded3598b785e4fbf33445815009a33cdefe0d9b9f1cf4' 
  AND token = 'j38UFOv69BOoL090KLfB9bXMCy4EbgdcqWtnN6+PauQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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