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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1efa7e9ad0a43312f316acc8f5707edac5385cf6194123a5777c4517419862a7' 
  AND token = 'J61kXQA3m6TpjMLmKa5gn6mer0BbhxlDI4gmiWybVXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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