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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0b323b5a6dff5bcc67a35ef7bbe108423c30fc59e9bc29692e0c4152017ec04' 
  AND token = 'd6LTDQpv7MtfkWqbT/2yJGXx7ii1oHesmIVlpWlZhKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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