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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcd19e660986750ff9da599a860d272cd70842e16fa67e6477a9096f42e3b179' 
  AND token = 'dnV9HzMFuuIE2jI1CNez0qBNgNIG6AXFLHOI/GXZ3rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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