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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ca4bb24497032c90350f05371e12e0cacb9193659fd483801cb8f82d75fa740' 
  AND token = 'CT+JsP4tCB5yqYkUhfisaiMyHydEg0fKKoxgcZuarDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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