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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcaae30973ef21f83243907e6b1e7f704239f72f7ad2bfe4110f0fa345d544b3' 
  AND token = 'EUje496irR7UNnA/d/RtEOdcT9EtnaM5zNc20zshW2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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