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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8861147a3679af10a550af9851ab1ff44805f1e9059040c4ae7ec4d887800a5a' 
  AND token = 'Mx85rTxY5CyARYTh5CEsr4fKIRofqwWvf4sigx23bfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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