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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce470dc2d238a3032865b340e1cb29c5d8e8bdae64ab4f31cf3cc14d0aba5f7b' 
  AND token = 'wOm9X2/EXm89urW4N1OtY1xYJCj+W+1NzbemUTspx2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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