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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bfc343c3c13ab06e2b6777d8a199d9bcab5f4797cb87750a432693e0f4e5782' 
  AND token = 'JIP/TWYSW3YaixMqbH5oApukIEktv95jFQkLXcLFdTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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