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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b7a52db59dd4f44b9267534b02117c707bcdca6c3f95b9307cdeaaaec1fedd4' 
  AND token = 'qvi4HzQkG7z0hgJt+mCCrSa2maqgNa7EZMyJJ2euLFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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