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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31b0a75576d7ec133260d334398345395871623aad888780f8422431d59d3fe3' 
  AND token = '8NGRXOezEDavUkzgNgpprH8VYesPVLCcGH9OC8uE694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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