SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5de2825497b2d2696ef5e467957cfba859f94b1eca00c0a0862fe0090816b7ec' 
  AND token = 'BpSUHLHG9zCqYeP7FQYvFuZH/hitoBmrorYmeXUb+DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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