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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c27fe93209f775c66f7d3c899f0a8c4c976f21135cd9c8f75845f1043d19537' 
  AND token = 'kArEwEwXh4G6As6ynYBNRmggNxAg1pWioqLfQc6fpRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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