SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb809d2633eee7ed6b7860f9785677f5f622bfe50321cc27fd6e924d491fd0f7' 
  AND token = '+vnqwWigIvo4bO2yzwsfxRHjGZLMJtTx+n9rMKdAdVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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