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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a3665c38e03f979b8a7b5cc25334fb48537f02b2247d4154ca7a4e1fcc6e108' 
  AND token = 'H80uMiBLHv3WVyayWBuruQ9qWVrs9FHj1Sg0Yu2bbbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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