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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '412ee6107fb0e4e7930706f902c3c88607c8493421d8bb794dd0f264167336e5' 
  AND token = 'pbcE2SLJ2leW5YmLqjjrrdaRQL28LZoAL0l9wdTQ2h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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