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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8de051ff4815cbaeed79dd38f0a6130b34f616b0a38fe6fcf0308c74a9682e97' 
  AND token = 'fWwCbDXPwhKfMT//UrSuRERfKhCHlxTdnOkCRPKWfVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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