SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a9fc487918bc9235fe78639eb48a4e335f91ef1eb2655bdf1e30b2192fafe2c' 
  AND token = 'LY6WSdglND+gXkRGEdxJUAyUjaqwWG+gj7ukHCNAIgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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