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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be0edb735e543a8e4a0853f49640c178eef6ef725d4d7ba6f1311d462c628c2e' 
  AND token = 'GNH/CzEngcx8EbPRicAVhajxOrlxQe1eQg02m6t0Azw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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