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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85fe17cb253ff23b9bc499e8d8ce9c62ee7ff405e23ba0ef46b9bc5eb1f085c' 
  AND token = 'gFnweJzGnx441jWCI64B0U9fliGTXhj7aoG6O0ZF3+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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