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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd24f11c7b185dcc164377cb77ce58ec503a68941057c537513417ee1647d1691' 
  AND token = 't7I9GWVWjXkn/aaLWzvtQ8RD+q/bwrTPY9FFMfHiOmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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