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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdbde0d8e7500b168728b4fe856c88562a0cbe9f2a3ea6ea68b118bf80418bcc' 
  AND token = 'RCPZTlgXKV8y0PWkF2ryAC2tl7C4HMCpdpjggwLS400=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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