SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c9e43f3b827ccfba1f5b2ddc281e12942040e3968035264bac47f1f6cc62b3' 
  AND token = '+iOspjEgy7LJFKzZR9FMbaC3w+Q4oplXmB58rQXPWa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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