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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4abef76fb9961cdb4b54295fb4e2f28b82bf3fe3f7cf34c8ab35ab6bf81553c7' 
  AND token = 'pdiIsrbOCRcKFP4h6xjd6KvNajAqZjy9wUTr99g3uvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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