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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4866a661420dfab52ae1ff785dbc6eff507927fedec4f5af8726430dfbc9d0' 
  AND token = 'WH8qrYaRvtqATc7iHZ7t1tjW/xjd6QDQ3PJP0z6Ly2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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