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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '673bf87c176eb1424e1cebefa03dae607b0318307aec5590a8c2c1b0aa8c7ca5' 
  AND token = 'Z376Vxi9SA/sKIrVBzZa+AkE9PLu8HvuBJjuXtHnSa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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