SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4136ab96ce9f9a45818078c759214677c50e55a9e7c2a4ed86ba099b989f2e2' 
  AND token = 'BvacCqR7SGE+FMa/Q522806LJ5vpFCwmZsZVLBuqgIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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