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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3333bc6c334c88a27473c2efd33ce994c74e75f0ebda55710949fe649b39083a' 
  AND token = '0yWCuCdBUbpT/zOtPGDY/3zA8kWLmz5BHC5ENlHQOns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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