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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72339e84afebbda4db6388786796dbaa48960dda871ec4e57c9d1597e34f97af' 
  AND token = 'c3ZjjODdZ8ZmOgps0QaI/X+OK1pptaACcO/fW8xTN90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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