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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '505a2622ff4c892543b44fdc7f5ab5e715ef223411c5c6f269defd995964e19d' 
  AND token = 'C1v05u6yww5+wpqzvDutyPFZ27JdasRi4IdJGyYnOM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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