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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b7ce87c7861207d02f339a4cf66dbebfa22f81acf6585e17e32892f7d129dbd' 
  AND token = '9z/WEBYXOmvcHK5WViDeHs3kOhsUAAninrXRhOQd2RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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