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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26122fccbe627fe46f81f6f1ffc68bc639655ec391b35f5f49570090cb2c6800' 
  AND token = 'lFGKkXw15ESzdurBzhku8KxUTk2OwTj1E1d+pagTSI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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