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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15f80e417be58dfbfcc4b2b1445afc127ebfb65a543129f57fc963a3806f074f' 
  AND token = 'x4QmdsxOnp0WDHRIriCzI1ZQbqpX+Ago15Q3OcjxXBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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