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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e396bfc136e81e8d31e7f1837c843f9310e80d62529d019603ffd09d320c806' 
  AND token = 'NcaYKW6oPYGDr5AdM7xZ7Tf/fpvkucFoaFndwSVs7RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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