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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4975beaec9ac6cfe8cbcfb00caace1a2da72904de1258690be0582d4faf0104d' 
  AND token = 'SzEFRygl8ZpTz+fp1ku3erarRlqwgIuWCHVg+s7F/0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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