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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '375ba1dc0a41fbb0f8f036a5320081a6faaabc97e9e7244eacfde7a00cc66564' 
  AND token = 'cu7yTfbul9cYKkgnf9qI58gvtjmqS+p+7Tlr3db0os0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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