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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afec9695a90fe0900c2451a40b876f342bb57e1d244a915e8cba9a1bfe22a5a4' 
  AND token = 'HGNwVbjrOXhV6DXUpFa05p6sqYGy54zF17LMa9JdcHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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