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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1123c3c061a2ef2c239bd44d12270dba1d248415df829c15ec3314b4e8716b23' 
  AND token = 's4E1WKkKDoJZ5Rk8Xp1G/P8D7Sj7Ad1UT4SGCt/DcDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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