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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa8f742207538e45129c2b6eac643b1ad0f4bea200067761dacdff0cf1a61420' 
  AND token = 'MD8qqqSrQ5vGYNHialP4w6m1Sdh8tPBxNU4K7npU970=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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