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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd08a40093cdc0ca6004ad07a6da9da2afe0cb3bd28df4c79cb1cc4cb40ec369f' 
  AND token = 'hfW/CI2rhg/BJX72qDj/jXPbBArH0pWnnZFdI8VtnMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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