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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82cce7cbc19b23dc08e315a252c1cb58ce6ce36077a8d1fcc1b7cc4794a63a08' 
  AND token = 'JwvMobE0/yPkIVN8jVubjESUz75eLn8A5MPgST2iQpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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